Finding the Third Proportional to 20,979 and 42,930

Step by Step Solution

1. Step 1: Write the proportion equation
   20,979 : 42,930 = 42,930 : x
2. Step 2: Convert to fraction form
   20,979/42,930 = 42,930/x
3. Step 3: Cross multiply
   20,979x = 42,930 × 42,930
4. Step 4: Simplify right side
   20,979x = 1,842,984,900
5. Step 5: Solve for x
   x = 1,842,984,900/20,979
6. Step 6: Final answer
   x = 87,849.03